Derivative of Position w/r/t Time vs Derivative of Time w/r/t Position

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Discussion Overview

The discussion revolves around the derivatives of position with respect to time and time with respect to position, exploring their meanings and potential applications. It includes considerations of instantaneous velocity and the reciprocal relationship between these derivatives.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant states that the derivative of position with respect to time is instantaneous velocity.
  • Another participant proposes that the derivative of time with respect to position would be the reciprocal of velocity, expressed in units of time over distance.
  • Some participants question the practical use of the derivative of time with respect to position, noting they have not encountered it in exercises.
  • It is suggested that if time is known as a function of displacement, discussing the rate of change of time with respect to displacement (dt/dx) could be meaningful.
  • One participant reflects on the abundance of mathematical concepts compared to their practical applications.
  • A later reply indicates that the reciprocal of velocity can provide insight into the time required to traverse a unit distance.

Areas of Agreement / Disagreement

Participants express uncertainty regarding the practical applications of the derivative of time with respect to position, with no consensus on its usefulness or common occurrence in exercises.

Contextual Notes

The discussion does not resolve the significance or applications of the derivative of time with respect to position, and it remains unclear under what conditions it might be relevant.

Femme_physics
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I know that the derivative of position with respect to time is instantaneous velocity. What is the derivative of time with respect to position then? Is it even meaningful?
 
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It would be the reciprocal of the velocity, in units of time over distance.
 


Is there any use to that? I never saw it in exercises.
 


I can't say that I recall any, but if you know time t as a function of displacement x, then it would be natural to talk about the rate of change of t with respect to x; that is, dt/dx.
 


Dory said:
Is there any use to that? I never saw it in exercises.

There's a lot more math in the world than there are uses for things.
 


Good answers
 


Well, the reciprocal of the velocity tells you the the time required to traverse the unit distance.
 

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